In the latest version of Rhino 7 (7.8.21196.05002, 2021-07-15) and in versions before that, the PackageManager dumps general, internal errors to the local command history, each time that you close it. I don’t have any of the concerned packages installed!
I find that annoying, since I’m in no position to make the developers of PetersTools and Synapse fix their package icons. Couldn’t the creators be notified about this, instead of pestering the users?
AppKit.NSImage reeks of Apple, so I guess this might be a Mac only issue?